Stove for drying molds.



c. MoRBB-EAD, 1 STOVE FOR DRYING MOLDSY. AHLIQATION r1LEn`Nov.14, 1907'.

'Patented sept. 29, 190s.

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Invento:

Wtn'ess'es Ly v,

- Y tty' CHARLES MOREHEAD, OF RUGBY, ENGLAND.

sTovE FOR DRYING MoLDs.

Specification of Letters Patent.

Patented sept. 29, 190s.

Application filed November 14, 1907. Serial No. 462,072.

To all whom it may concern:

Be it known that I, CHARLES MOREHEAD, a subject of the King of Great Britain, and residing at Rugby, in England, have invented certain new and useful Improvements in Stoves for Drying Molds, of which the following is a specification.

This invention relates to stoves for drying molds and the like, and particularly to that form of stove through which air from an induction opening flows under the action of a propelling jet of air which has been heated prior to its issue through the jet openings.

n the specification of British Letters Patent No. 512 of 1906 granted to me, I have described and illustrated such a stove; in it an air heating conduit is situated in the bridge for the purpose of heating the propelling air before it reaches the jet openings or injector device.

One feature of the present invention is that the air heating conduit and injector, instead of being situated in the bridge are situated within the stove in the an le between the top inner face of the rear wa and the inner or lower face of the upper wall. In this situation, though the block of refractory material,

, say cast iron, in which the air conduits and injector are formed, gets quite hot enough to suciently heat the air passed through it, it is not nearly so subj ect to the eroding action of the current of hot gas passing from the main chamber of the stove to the vertical outlet Hue, as it was when it constituted, as hitherto, the upper portion of the bridge so that the hot gas stream iowedover it as over a Weir. The block of cast iron or other refractory material, consequently, lasts longer than in the earlier types of stove, so that the stove need seldom be stop ed for repair and its efficiency is consequent y increased while the cost of its maintenance is reduced.

In the accompanying drawings :-Figure 1 is a central Vertical section. through a stove constructed according to the present invention; Fig. 2 is a front elevation of the same, and Fig. 3 is a horizontal section on the line 3--3 of Fig. 1.

Like letters indicate like parts throughout the drawings.

The fire space or chamber of the stove is indicated at A, and communicating therewith, preferably at the bottom, is an air inlet B, controlled by a damper or shutter B1 which is preferably adjustable. Additional air ports C C1 are provided in the front and side Walls of the chamber A. At the back of the bridge A1 of the chamber is a vertical flue D which communicates at its upper end with the top of the chamber A, and at its other end with an outlet adapted to fit over the mouth of the mold to be dried. Along the front of the air inlet B is arranged a pipe F having a number of holes F1 on its inner side. The pipe F and the conduit E hereinafter referred to, are both connected, the latter by way of the pipe F0, with a supply pipe G through which air under pressure can be forced into the furnace. A cock G1 controlsv the supply of compressed air to the pipe F and a cock G2 controls the supply of compressed air to the pipe F0 and conduit E.

All the parts thus far set out in connection with reference letters are as in the aforesaid specification of A`British Letters Patent No.

According to the present invention, a cast iron block A20 (or a block of refractory material) cored to form an air heating conduit E and a second conduit E1 which is a continuation of the first conduit and which is provided with openings E2 forming an injector, yis situated within the chamber A in the angle Where the top inner face of the rear Wall a. meets the inner or lower face of the wall a1. The conduits E and E1 are so disposed within the block A20 that the openings E2 point down the center, approximately, of the vertical flue D.

The stream of ases fiowing from the chamber A into the {Iue D is found to have less effect upon the block A20 than upon the upper end or marginal portion of the bridge. Wear of the latter, inasmuch as it no longer has any special internal structure, is less detrimental to the life of the apparatus than would be any Wearing of the block A20, which latter is less exposed to wear by reason of its situation, in dead space in the angle aforesaid.

In starting up the furnace air is forced through the pipe F and the holes F1 until combustion in the furnace has set in. When the furnace has been started the cock G2 is opened and air is introduced into pi e F0 and conduit E Where it is heated and ows into the injector E1 and thence through the jet openings E2 into the vertical flue D taking upper.

with it the heated gases from the furnace and incidentally tending to keep the heated gases away from the block A20.

What I claim as my invention and desire to secure by Letters Patent is 1. In a drying stove the combination with the stove body of a bridge, and an air heating conduit and injector situated within the stove above the outlet between the top of the bridge and the stove wall and in the angle between the top inner face of the rear wall and the lower face of the upper wall.

2. In a drying stove the lcombination with the stove body of a bridge, and an air heating conduit and injector formed in a block of refractory material situated within the stove above the outlet between the top of the bridge and the stove wall and in the angle between the top inner face of the rear wall and the lower face of the upper wall.

3. In a drying stove the combination with l the stove bodyof a bridge, and an air heating conduit situated within the stove above the outlet between the top of the bridge' and the stove wall and in the angle between the top inner face of the rear wall and the lower iaee of the upper wall.

4. In a drying stove the combination with the stove body of a bridge, and an air injector situated within the stove above the outlet between the top of the bridge and the stove wall and in the angle between the top inner face of the rear wall and the lower face of the upper wall.

In testimony whereof I have signed my name to this speciiieation in the presence ol two subscribing witnesses.

CHARLES MOREUEAD.

Witnesses CHARLES Il. FULLER, J A. FOSTER,

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